* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
}

img {
    width: 100%;
    vertical-align: middle;
}

.box {
    width: 1110px;
    height: 247px;
    margin: 20px auto;
    /* background-color: pink; */
}

.box li {
    position: relative;
    float: left;
    width: 350px;
    height: 247px;
    margin-right: 30px;
    overflow: hidden;
}

.box li:last-child {
    margin-right: 0;
}


.box .txt {
    position: absolute;
    left: 0;
    bottom: -50px;
    width: 350px;
    height: auto;
    padding: 20px 30px;
    z-index: 1;
    color: #fff;
    transition: transform .5s;
    /* transition: all .5s; */
}

.box .txt h4 {
    font-size: 14px;
    font-weight: 400;
    line-height: 2em;
    color: #fff;
}

.box .txt h5 {
    margin-bottom: 40px;
    font-size: 18px;
    line-height: 1.5em;
    color: #fff;
}

.box .txt p {
    color: #fff;
    font-size: 14px;
}

.box .txt p .iconfont {
    color: #c7000b;
    vertical-align: middle;
    font-size: 20px;
    font-weight: 700;
}

/* 1. 渐变背景的盒子 */
.box li a::after{
    position: absolute;
    left: 0;
    top: 0;
    content: '';
    width: 350px;
    height: 247px;
    background-image: linear-gradient(
        transparent,
        rgba(0,0,0,0.7)
    );

    opacity: 0;
    transition: all .5s;
}

/* 2.2 渐变背景显示 */
.box li:hover a::after{
    opacity: 1;
}

/* 2. hover效果 */
/* 2.1 图片缩放 */
.box li .pic img{
    transition: all .5s;
}

.box li:hover .pic img{
    transform: scale(1.2);
}

/* 2.3 文字向上移动 */
.box li:hover .txt{
    transform: translateY(-50px);
}